The Doctor is a Tier 4 support ship able to repair in radius, burst heal and speed, and upgrade movement speed. at least one is almost necessary for any prolonged attack on the enemy base. 

Strategy for play is the same as that of the healer. 

Besides, it is the fastest ship in Faster than the starting ship twice. 

Ships of Warin.Space
Base Ship
The DoctorMechanicD.O.D.AlertStealthShogunThe MothSuicide SquadBullyWurshipB.R.U.C.E.The Wall